81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* $OpenBSD: csi_util.c,v 1.2 2022/01/10 23:03:07 tb Exp $ */
|
|
/*
|
|
* Copyright (c) 2018 Joel Sing <jsing@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <openssl/bn.h>
|
|
|
|
#include "csi.h"
|
|
#include "csi_internal.h"
|
|
|
|
int
|
|
csi_integer_to_bn(struct csi_err *err, const char *field,
|
|
struct csi_integer *integer, BIGNUM **bn)
|
|
{
|
|
BN_clear_free(*bn);
|
|
*bn = NULL;
|
|
|
|
if (integer->len > CSI_MAX_BIGNUM_BYTES) {
|
|
csi_err_setx(err, CSI_ERR_INVAL, "%s too large", field);
|
|
goto err;
|
|
}
|
|
if ((*bn = BN_bin2bn(integer->data, integer->len, NULL)) == NULL) {
|
|
csi_err_setx(err, CSI_ERR_MEM, "out of memory");
|
|
goto err;
|
|
}
|
|
return 0;
|
|
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
csi_bn_to_integer(struct csi_err *err, const BIGNUM *bn,
|
|
struct csi_integer *integer)
|
|
{
|
|
uint8_t *b = NULL;
|
|
int len = 0;
|
|
|
|
freezero((uint8_t *)integer->data, integer->len);
|
|
integer->data = NULL;
|
|
integer->len = 0;
|
|
|
|
len = BN_num_bytes(bn);
|
|
if (len < 0 || len > CSI_MAX_BIGNUM_BYTES) {
|
|
csi_err_setx(err, CSI_ERR_INVAL,
|
|
"invalid bignum length %i", len);
|
|
goto err;
|
|
}
|
|
/* XXX - prepend zero to avoid interpretation as negative? */
|
|
if ((b = calloc(1, len)) == NULL)
|
|
goto errmem;
|
|
if (BN_bn2bin(bn, b) != len)
|
|
goto errmem;
|
|
|
|
integer->data = b;
|
|
integer->len = (size_t)len;
|
|
|
|
return 0;
|
|
|
|
errmem:
|
|
csi_err_setx(err, CSI_ERR_MEM, "out of memory");
|
|
err:
|
|
freezero(b, len);
|
|
|
|
return -1;
|
|
}
|